EPROM Replacement
716825R
(3D3 Instruments with Serial Suffix D and Later)
Reference: Use this instruction with replace-
ment part 716825R.
Tools Needed: Phillips screwdriver, flat-
bladed screwdriver, static
grounding (earthing) wrist
strap (included), 28-pin IC
removal tool (alternatively, a
small screwdriver may be
used with caution so as not to
damage the IC or the socket).
Warning-Hazardous Voltage
Warning-Internal components may
be damaged by static electricity.
CAUTIONS:
• Instrument calibration and all cus-
tomized settings will be lost when
the EPROM is replaced. Therefore,
make sure the current sample and
block probe bin numbers and the
sample stir amplitude are recorded
in the service log so that you can
reset these vital numbers into the
replacement EPROM.
• Never unpack, touch or handle an
EPROM or any other integrated
circuit without wearing a ground-
ing (earthing) strap to minimize
your static charge.
Upon completion of this replacement, the
software version reported at power-up will
match the version number printed on the new
EPROM.
Instruction:
1. Turn off the power and unplug the instru-
ment.
2. Attach the static grounding strap to your
wrist and stick the adhesive end to a suit-
able bare-metal ground.
3. Remove the screws securing the instru-
ment cover, and remove the cover:
a. Remove the two sets of screws from
the side panels and the two screws
from the rear panel.
b. Slide the instrument cover up and off.
4. Locate EPROM IC U8 on the circuit
board. (U8 bears a white label indicating
the software version number.) Note the
orientation of the small locating notch in
one corner, and/or locating mark on one
edge of the IC.
5. Make sure your static draining connection
is intact, and then remove IC U8 from the
circuit board.
6. Observing proper orientation and making
sure each of the 28 pins enters its proper
socket, press the new IC U8 firmly into
the sockets.
7. Replace the instrument cover and recon-
nect the power cord.
8. Turn on the power switch. The instru-
ment will default to the Setup mode until
sample and block probe bin numbers are
entered.
For additional information or technical assistance,
please contact Advanced Instruments Hot-Line
®
Service Center (U.S. 1-800-225-4034, outside
North America +US 1-781-320-9000).
71P825R Rev1
(4D35 Service Manual)
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